Your best getting a sony tube superflat CRT monitor. A lot better than TFT Brighter and have good resolution & cheap these days.
As for the raptors theres no real difference in the performance of the two.
For Value your better getting two 36K raptors in a Raid 0 array & two 7k250 160gig drives in a raid 0 array.
Cheaper than getting 2x74K raptors.
Your Boot drive raptors will carry all the 'Use all the time programs' and your 7k250's for all others, downloads, films etc.
That totals nearly 400gig storage for the price of 148gig.
As you might have guessed thats my next project.
Intel Core2Duo 6400 @ 3.4Ghz
4GB Geil 6400 Ultra
3 x 500 Gb Samsung HD
EVGA 8800 Ultra OC